<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>bootstrap</title>
    <link rel="stylesheet" href="bootstrap/css/bootstrap.min.css">
    <script src="jquery/jquery-3.3.1.js"></script>
    <script src="bootstrap/js/bootstrap.min.js"></script>
</head>
<body>
    <p class="text-left">慕课网</p>
    <p class="text-center">慕课网</p>
    <p class="text-right">慕课网</p>
    <p class="text-lowercase">HELLO</p>
    <p class="text-uppercase">hello</p>
</body>
</html>